Protractor and gage



E. T. AYERS.

PROTRACTOR AND GAGE.

Patented Oct. 28, 1919.

ATTORNEYS v nvmvron E Z 722 @JZQ 1 81 5 WITNESSES ELMER T. AYERS, OF SPARTA, TENNESSEE.

V PROTRACTOR AND GAGE.

Specification of Letters Patent.

Patented Oct. 28, 1919.

Application filed June 2, 1919. Serial No. 301,204.

To all whom it may concern:

Be it known that I, Emma T. Arline, a citizen of the United States, and a resident of Sparta, in the county of lVhite and State of Tennessee, have invented certain new and useful Improvements in Protractors and Gages, of which the following is a specification.

My present invention relates generally to protractors, and more particularly to a combined protractor and gage, my object being the provision of a simple, inexpensive implement of this nature susceptible of ready adjustment and manipulation, and capable of a variety of uses and of eflicient and effective results.

Further objects, relating more particularly to the details of construction of the device, will plainly appear in the course of the following description, reference being made to the accompanying drawing, which forms a part of this specification, and in I which Figure 1 is a perspective view illustrating my invention complete,

2 is an elevation of a portion thereof looking from the opposite side as compared to Fig. 1, and

Fig, 3 is a sectional view taken on line 3-3 of Fig. 2.

Referring now to these figures, my invention proposes the use, in a device of this nature, of a square generally indicated at 10, which may be calibrated along its legs 11 and 12 in theusual way, and one leg of which, commonly known as the blade, is

provided, with a lengthwise slot 13 for the major portion of its length.

The square thus formed is utilized in connection with a clamp, consistingof spaced facing clamping members 14 and 15, approximately semi-circular in form, of which the member 15 is slightly reduced with respect to the member 14 so that the scale or calibration 16 of one face of the member 14 facing the member 15, will be exposed along the peripheral edge of the latter, both of these members 14 and 15 having straight edges 17, which, from an inspection of Figs. 2 and 8, come into registry, it will be noted, when one of the index marks 18 of the member 16 as seen in Fig. 1, is opposite the zero point of the scale 16 of the member 14.

These members 14 and 15, between which the slotted blade 11 of the square is extended, are connected by a central-pivot and along the inner face of the member 15 as i seen in Fig. 1 so that the square is angular-1y adjustable with the member 15 in respect to the member 14.

Along its straight edge 17, the member 14 has a laterally projecting. rib 21 which extends beyond the outer face of the said member, as well as projecting at beyond the sides of the member, and the upper face of this laterally projecting rib 21, which is parallel to the straight edge 17, has a spirit level 22 which thus cooperates with the straight edge 17 and is capable of cooperation with the tongue of the square.

The clamping bolt 19, as shown, projects through the slot 13 of the blade 11 of the square so that the clamp as a wholeis thus adjustable along the blade 11 for the full length of its slot 13 and the member 15 of the clamp, together with the square, may be adjusted angularly with respect to the member 14, at any point along the length of t .e adjustment of the clamp upon the square, it being borne in mind of course, that the slot of the member 15 holds thesquare so that its blade 11 is at exactly right angles with respect to the straight edges 17 when the straight edges of the two members 14 and 15 of the clamp are in alined relation.

It is furthermore obvious that the outer surface of the Inember'15 may, if desired,

be provided with various scales and rules simple, strong and durable and capable of utilizing in connection with the clamps thereof, a square of conventional form, by simply forming a slot 13 in one of the legs of the square.

I claim 1. An implement of the character described, comprising a square, the blade of which is provided with a longitudinal slot, a pair of clamping members bQliWQii'l which the slotted blade of the square is extended and adjustable, one of said members being provided in its inner face with a groove in which the said slotted blade of the square is slidably disposed, said clamping members having straight edges arranged to aline with one another and arranged at right angles with respect to the groove of the first mentioned clamping member, the second clamping member having a rib outstanding laterally therefrom along its said straight edge, a spirit level carried by the said rib, and a clamping and pivot bolt extending through and connecting the said clamping members and projecting also through the slot of the said square.

2. An implement of the character de scribed, comprising a square having the blade thereof provided with a longitudinal slot, a clamp including side members, one of which has a groove in its inner face in which the slotted leg of the square is slidable, a clamping and pivot bolt connecting the said members and extending through the slot of the square, said members being generally of semi-circular form and having straight edges arranged to register with one another and disposed at right angles with respect to the square-receiving groove, as described.

8. An implement of the character described, comprising a square having the" blade thereof provided with a longitudinal slot, a clamp including opposed clamping members, between which the slotted blade of the square is extended, a clamping and pivot bolt connecting-the said clampii'zg members and extending through the slot of the said blade of the square, one of said members being slightly reduced with respect to the other and having an index point, the other of said members having on its inner face a protractor scale with which the index point of the first member coiiperates, said first named member having a groove in which the slotted blade of the square is disposed, and the other or said members having a straight edge and a rib outstanding therefrom along the straight edge, and a spiritlevel carried by the said rib, for the purpose described.

at. An implement of the character de scribed, comprising a square having one longitudinally slotted leg, a clamp including opposed clampinc members, one of which is provided with a protractor scale and the other of which has an index point coiiperating with the scale, said last named member having a groove in its inner face in which the slotted leg of the squareis slidable, a clamping and pivot bol extending through and connecting the said members, said members having straight edges arranged to register and of which the straight edge of the last named member is disposed at right angles with respect to the groove thereof, the said first named member having a laterally outstanding rib along its straight edge, and a spirit level in the said rib, as described.

ELMER T. AYERS.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Eatents. Washington, D. Q. 

